70439729 has 2 divisors, whose sum is σ = 70439730. Its totient is φ = 70439728.

The previous prime is 70439659. The next prime is 70439737. The reversal of 70439729 is 92793407.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45589504 + 24850225 = 6752^2 + 4985^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70439729 is a prime.

It is not a weakly prime, because it can be changed into another prime (70439129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35219864 + 35219865.

It is an arithmetic number, because the mean of its divisors is an integer number (35219865).

Almost surely, 2^70439729 is an apocalyptic number.

It is an amenable number.

70439729 is a deficient number, since it is larger than the sum of its proper divisors (1).

70439729 is an equidigital number, since it uses as much as digits as its factorization.

70439729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 95256, while the sum is 41.

The square root of 70439729 is about 8392.8379586407. The cubic root of 70439729 is about 412.9897047894.

The spelling of 70439729 in words is "seventy million, four hundred thirty-nine thousand, seven hundred twenty-nine".